Description: tcpcopy It is an online TCP duplication tool and can be used for testing (using netlink and raw sockets). Description: It can help you find bugs without deploying your server software on your production servers.It can also be used to do smoke testing against your products. For example, when you want to migrate your web server from Apache to Nginx, tcpcopy can help you test it. Apache is running online, while tcpcopy can copy the TCP flows from Apache to Nginx. To Nginx, the TCP flows are just forwarding to it. This will not affect Apache at all except cost a little network bandwidth and CPU load. Scenarios: 1) Distributed stress testing Use tcpcopy to copy real-world data to stress test your server software. Bugs that only can be produced in high-stress situations can be found. 2) Hot backup It is very suitable for backup tasks if connections are short-lived. The request loss ratio is quite low (e.g. 0.00001). 3) Online testing Prove
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